S.37(1): Business expenditure – lease rent – lease rent expenditure was recognized on straight-lining basis, which led to creation of additional lease rental liability in relevant assessment year, would be deductible – Incremental liability on account of lease rental equalization provided for pursuant to adoption of AS-19 having accrued during relevant previous year was allowable deduction in computing income for said year, notwithstanding that such liability may relate to earlier years.[ S.145, AS -19 ]